[With optimizations provided by ALCF experts], Prabhat’s job ran simultaneously on 750,000 of Mira’s 786,432 processor-cores. In just an hour and a half, he used 1 million processor hours. “In one shot, I obtained statistics about extratropical cyclones for every ensemble run in CMIP5 – this particular analysis might have taken over a decade to complete on a conventional desktop system” said Prabhat.